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Shayne Cunis, executive programme director for the central interceptor, said all four groups have demonstrated that they have the ability and experience to deliver this project to the required standard, while adding significant value to the project.

Design and technical documentation will be released this month, and the Request for Proposal will be issued to the shortlisted contractors in May.

Meanwhile, Auckland Council has announced a plan to issue green bonds for environmental projects like water infrastructure and public transport.

"We need to invest billions of dollars in Auckland's infrastructure over the coming decade. That includes focusing on projects which make Auckland greener and adapting to climate change. It makes sense to leverage the strong investor demand for green bonds to assist us with funding these projects," Mayor Phil Goff said.